(C) International Organization for Standardization 1986
     Permission to copy in any form is granted for use with
     conforming SGML systems and applications as defined in
     ISO 8879, provided this notice is included in all copies.

 Character entity set. Typical invocation:
     ENTITY % ISObox PUBLIC
       "ISO 8879:1986//ENTITIES Box and Line Drawing//EN">
     %ISObox;

 All names are in the form: box1234, where:
    box = constants that identify a box drawing entity.
    1&2 = v, V, u, U, d, D, Ud, or uD, as follows:
      v = vertical line for full height.
      u = upper half of vertical line.
      d = downward (lower) half of vertical line.
    3&4 = h, H, l, L, r, R, Lr, or lR, as follows:
      h = horizontal line for full width.
      l = left half of horizontal line.
      r = right half of horizontal line.
    In all cases, an upper-case letter means a double or heavy line.

ENTITY boxh   SDATA "[boxh  ]"--horizontal line 
ENTITY boxv   SDATA "[boxv  ]"--vertical line
ENTITY boxur  SDATA "[boxur ]"--upper right quadrant
ENTITY boxul  SDATA "[boxul ]"--upper left quadrant
ENTITY boxdl  SDATA "[boxdl ]"--lower left quadrant
ENTITY boxdr  SDATA "[boxdr ]"--lower right quadrant
ENTITY boxvr  SDATA "[boxvr ]"--upper and lower right quadrants
ENTITY boxhu  SDATA "[boxhu ]"--upper left and right quadrants
ENTITY boxvl  SDATA "[boxvl ]"--upper and lower left quadrants
ENTITY boxhd  SDATA "[boxhd ]"--lower left and right quadrants
ENTITY boxvh  SDATA "[boxvh ]"--all four quadrants
ENTITY boxvR  SDATA "[boxvR ]"--upper and lower right quadrants
ENTITY boxhU  SDATA "[boxhU ]"--upper left and right quadrants
ENTITY boxvL  SDATA "[boxvL ]"--upper and lower left quadrants
ENTITY boxhD  SDATA "[boxhD ]"--lower left and right quadrants
ENTITY boxvH  SDATA "[boxvH ]"--all four quadrants
ENTITY boxH   SDATA "[boxH  ]"--horizontal line
ENTITY boxV   SDATA "[boxV  ]"--vertical line
ENTITY boxUR  SDATA "[boxUR ]"--upper right quadrant
ENTITY boxUL  SDATA "[boxUL ]"--upper left quadrant
ENTITY boxDL  SDATA "[boxDL ]"--lower left quadrant
ENTITY boxDR  SDATA "[boxDR ]"--lower right quadrant
ENTITY boxVR  SDATA "[boxVR ]"--upper and lower right quadrants
ENTITY boxHU  SDATA "[boxHU ]"--upper left and right quadrants
ENTITY boxVL  SDATA "[boxVL ]"--upper and lower left quadrants
ENTITY boxHD  SDATA "[boxHD ]"--lower left and right quadrants
ENTITY boxVH  SDATA "[boxVH ]"--all four quadrants
ENTITY boxVr  SDATA "[boxVr ]"--upper and lower right quadrants
ENTITY boxHu  SDATA "[boxHu ]"--upper left and right quadrants
ENTITY boxVl  SDATA "[boxVl ]"--upper and lower left quadrants
ENTITY boxHd  SDATA "[boxHd ]"--lower left and right quadrants
ENTITY boxVh  SDATA "[boxVh ]"--all four quadrants
ENTITY boxuR  SDATA "[boxuR ]"--upper right quadrant
ENTITY boxUl  SDATA "[boxUl ]"--upper left quadrant
ENTITY boxdL  SDATA "[boxdL ]"--lower left quadrant
ENTITY boxDr  SDATA "[boxDr ]"--lower right quadrant
ENTITY boxUr  SDATA "[boxUr ]"--upper right quadrant
ENTITY boxuL  SDATA "[boxuL ]"--upper left quadrant
ENTITY boxDl  SDATA "[boxDl ]"--lower left quadrant
ENTITY boxdR  SDATA "[boxdR ]"--lower right quadrant